Question

(a+b       2b)       
------  -    -----   * (a+b)
  a            a+b
помогите))

Answer 1

1) ( a + b )/a - ( 2b )/( a + b ) = ( ( a + b )^2 - 2ab ) / ( a( a + b )) = ( a^2 + b^2 )/( a( a + b ))
2) [( a^2 + b^2)/( a( a + b ) ] : ( a + b ) = ( a^2 + b^2 ) / ( a( a + b )^2 )